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Multiple Molecular H2 Outflows in AFGL 618
Bachiller, R.; Forveille, T.; Cox, P. +3 more
We report high spatial (0.5") and high spectral (9 km s-1) resolution spectro-imaging of the 2.12 µm H2 1-->0 S(1) line in the proto-planetary nebula AFGL 618 using BEAR at the Canada-France-Hawaii Telescope. The observations reveal the presence of multiple, high-velocity, molecular outflows that align with the remar…
Galactic archaeology: initial mass function and depletion in the `thin disc'
Schröder, K. -P.; Pagel, B. E. J.
We determine the initial mass function (IMF) of the `thin disc' in the range of, approximately, 1.1 to 4 Msolar by means of a direct comparison between synthetic stellar samples [for different matching choices of IMF, star formation rate (SFR) and depletion] and a complete (volume-limited) sample of single stars near the Galactic plane …
Radial dependence of intermittency in the fast polar solar wind magnetic field using Ulysses
Balogh, A.; Pagel, C.
The Ulysses spacecraft, in a polar orbit of the Sun, spent almost 3 years sampling the pure polar coronal fast wind at solar minimum between 1994 and 1996. Turbulence in coronal fast wind, unaffected by stream shears with slow solar wind, evolves more slowly than fast wind turbulence in the ecliptic and is a more homogenous system. However, it is …
The Dust Ring of Luminous Blue Variable Candidate HD 168625: Infrared Observations and Model Calculations
Ueta, Toshiya; Meixner, Margaret; Bobrowsky, Matthew +2 more
We present a 2.218 µm image from the Hubble Space Telescope/Near Infrared Camera and Multi-Object Spectrometer (NICMOS) and a 55 µm image from ISOPHOT of the dust ring surrounding the luminous blue variable (LBV) candidate HD 168625, together with new temperature and optical depth maps derived from mid-IR images. The shell is detached …
INTEGRAL-RXTE observations of Cygnus X-1
Nowak, M. A.; Rodriguez, J.; Wilms, J. +11 more
We present first results from contemporaneous observations of Cygnus X-1 with INTEGRAL and RXTE, made during INTEGRAL's performance verification phase in 2002 November and December. Consistent with earlier results, the 3-250 keV data are well described by Comptonization spectra from a Compton corona with a temperature of kT ~ 50-90 keV and an opti…
XMM-Newton observations of two hyperluminous IRAS galaxies: Compton-thick quasars with obscuring starbursts
Fabian, A. C.; Crawford, C. S.; Wilman, R. J. +1 more
We present XMM-Newton observations of two hyperluminous IRAS galaxies (LBol > 1013h-250 Lsolar), neither of which were previously detected by ROSAT. Published models of the infrared spectral energy distributions imply that a starburst and obscured quasar contribute equally to the power of e…
A study of RV in Galactic O stars from the 2MASS catalogue
Patriarchi, P.; Perinotto, M.; Morbidelli, L.
We present new measurements of the interstellar reddening parameter RV=AV/E(B-V) towards 185 O stars, using J, H, Ks photometry from the 2MASS project. The results are combined with data from the literature of 95 stars where RV has been derived with the same technique, 22 of which in common with our pres…
Observations of the X-Ray Afterglows of GRB 011211 and GRB 001025 by XMM-Newton
Trudolyubov, Sergey P.; Borozdin, Konstantin N.
We present the XMM-Newton observations of X-ray afterglows of the gamma-ray bursts GRB 011211 and GRB 001025. For GRB 011211, XMM detected a fading X-ray object with an average flux in 0.2-10 keV declining from 2.7×10-13 ergs s-1 cm-2 during the first 5 ks of the 27 ks observation to 1.0×10-13 ergs s
Minimum variance free wave identification: Application to Cluster electric field data in the magnetosheath
Walker, S. N.; Dunlop, M.; Amata, E. +4 more
The electric field measurements provided by the EFW instrument on board Cluster spacecraft are used to identify the mode of plasma waves observed in the magnetosheath. Previous identifications of magnetosheath wave modes have involved either the use of dimensionless transport ratios (DR) calculated using magnetic field and plasma parameters or the…
3C459: a highly asymmetric radio galaxy with a starburst
Muxlow, T. W. B.; Saikia, D. J.; Thomasson, P.
Multifrequency radio observations of the radio galaxy 3C459 using MERLIN, VLA and the EVN and an optical Hubble Space Telescope (HST) image using the F702W filter are presented. The galaxy has a very asymmetric radio structure, a high infrared luminosity and a young stellar population. The eastern component of the double-lobed structure is brighte…